CN107356318A - For detecting the sensitized reaction optical fiber sensing system with acoustic emission signal in location-plate - Google Patents
For detecting the sensitized reaction optical fiber sensing system with acoustic emission signal in location-plate Download PDFInfo
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- CN107356318A CN107356318A CN201710426582.3A CN201710426582A CN107356318A CN 107356318 A CN107356318 A CN 107356318A CN 201710426582 A CN201710426582 A CN 201710426582A CN 107356318 A CN107356318 A CN 107356318A
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- China
- Prior art keywords
- optical sensor
- fibre optical
- needle tubing
- sensitized reaction
- steel needle
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
It is used to detect the sensitized reaction optical fiber sensing system with acoustic emission signal in location-plate the present invention relates to a kind of, the system includes laser, sensing module and demodulating system, described sensing module is sensitized reaction fibre optical sensor, and described sensitized reaction fibre optical sensor is connected with demodulating system；The package casing of sensitized reaction fibre optical sensor is steel needle tubing, the steel needle tubing surface of the test lead of sensitized reaction fibre optical sensor grinds off covering, the sensing unit of sensitized reaction fibre optical sensor is packaged in steel needle tubing, steel needle tubing is wherein bonded parallel to sample to be tested surface, the fixing device of package casing with sample to be tested surface by couplant.Compared with prior art, the present invention has the advantages that small volume, point contact type measurement, steel needle tubing encapsulation enhancing signal can be achieved and realize high frequency sound field single-point acoustical signal measurement.
Description
Technical field
The present invention relates to ultrasound detection field, is used to detect the increasing with acoustic emission signal in location-plate more particularly, to a kind of
Quick packaged fiber sensor-based system.
Background technology
Traditional acoustic-electric type transducer technology specification, technical maturity is easy to use, but it is difficult under some adverse circumstances
With normal work, such as detection chemistry either in electromagnetic environment or high intensity sound field.And fibre-optical acoustic sensor, due to making
Insulated with material, can electromagnetism interference, and material anti-pressure ability is strong, high sensitivity, it is corrosion-resistant the features such as, be increasingly concerned by people.
In addition, with the progress of manufacturing technology, its cost is also constantly reducing, easily multiplexing, has very high cost performance, is traditional acoustic-electric
The ideal substitute of type transducer.
Longer yet with the sensitive zones of fiber grating, the signal received is the integration on whole sensitive zones, right
Difficulty is caused in the acoustical signal of measurement high frequency sound field single-point, so needing to be packaged optical fiber, is made it easy in measurement space
The acoustical signal of certain point.
The content of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind is used to detect and determine
The sensitized reaction optical fiber sensing system of acoustic emission signal in the plate of position.The technical problems to be solved by the invention are to be directed to fiber grating
Sensitive zones it is longer, the signal received is the integration on whole sensitive zones, for measure high frequency sound field single-point sound believe
Number difficulty is caused, so needing to be packaged optical fiber, make it easy to that certain point acoustic emission signal in plate is detected and determined
Position.The present invention is packaged using steel needle tubing and fixing device to fiber grating, for strengthening acoustical signal, and by needle tubing side
Steel covering is ground off to strengthen its Oscillation Amplitude, improves the sensitivity of fiber-optic grating sensor.System of the present invention has body
Product is small, the characteristics of point contact type measurement can be achieved, and is easy to measurement plate medium-high frequency sound field single-point acoustical signal.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of to be used to detect the sensitized reaction optical fiber sensing system with acoustic emission signal in location-plate, the system includes laser
Device, sensing module and demodulating system, described sensing module are sensitized reaction fibre optical sensor, and described sensitized reaction optical fiber passes
Sensor is connected with demodulating system；
Described laser launches laser conduction to fiber-optic grating sensor, the sensing of described sensitized reaction fibre optical sensor
The acoustic signals of tabular sample to be tested surface certain point, acoustic signals change into electric signal and reach demodulating system, and demodulating system is carried out
Demodulation, obtains last acoustical signal.
The package casing of described sensitized reaction fibre optical sensor include located at head steel needle tubing and with bracing members pipe
The cylindric fixing device of connection.
Described steel needle tubing and the junction of cylindric fixing device are in conical surface-shaped.
Described cylindric fixing device passes through couplant and tabular sample to be tested surface bonding.
Described steel needle tubing is vacantly parallel with tabular sample to be tested surface.
The side of described steel needle tubing, which grinds off surface coverings, makes its structure asymmetric.
Compared with prior art, the present invention has advantages below：
(1) fixing device couplant will a little bond on the outside of needle tubing with sample to be tested, fiber grating is only treated
Test specimens surface a little measures, and overcomes because the sensitive zones of fiber grating are longer, the signal received is entirely to pass
Integration on sensillary area domain, it is difficult for caused by measuring the acoustical signal of high frequency sound field single-point；
(2) sound letter hanging during the steel needle tubing partial test of sensitized reaction fibre optical sensor, that enhancing fixing device measures
Number vibration；
(3) needle tubing side steel covering is ground off to remove its symmetry, suppresses steel pipe itself vibration, improve fiber grating
The sensitivity of sensor；
(4) present system has small volume, the characteristics of point contact type measurement can be achieved, and is easy to measurement plate medium-high frequency sound field
Single-point acoustical signal.
Brief description of the drawings
Fig. 1 is the workflow diagram of present system；
Fig. 2 is present system apparatus structure sketch；
In figure：1st, afterbody optical fiber；2nd, with sample to be tested junction；3rd, steel needle tubing；4th, Fibre Optical Sensor area.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is the part of the embodiment of the present invention, rather than whole embodiments.Based on this hair
Embodiment in bright, the every other reality that those of ordinary skill in the art are obtained on the premise of creative work is not made
Example is applied, should all belong to the scope of protection of the invention.
Embodiment
It is used to detect the sensitized reaction optical fiber sensing system with acoustic emission signal in location-plate the invention discloses a kind of.Such as
Shown in Fig. 1, sensitized reaction optical fiber sensing system of the present invention, packaged type and detecting system are included.For acoustic emission signal in plate
The fibre optical sensor sensitized reaction mode and detecting system of detection and positioning include laser, fiber optic sensor element, steel pin
Pipe, couplant and demodulating system.Laser is used to launch required laser；Core of the fiber optic sensor element as the sensor
Point, for detecting Lamb wave；Steel needle tubing and fixing device are connected the package casing as the sensor, be packaged in fiber grating it
Outside；Couplant is used to bond fixing device and sample to be tested；Demodulating system, which is used to demodulate, obtains last acoustical signal.Optical fiber light
Gate sensor is packaged within the needle tubing and fixing device, forms monomer-type sensor.
As shown in Fig. 2 core of the fiber-optic grating sensor as sensor, for receiving the sound letter in plate
Number；The package casing of steel needle tubing 3 and fixing device as sensor, is packaged in outside fiber grating；It is connected with sample to be tested
Place 2 is a bit on the outside of fixing device, and fixing device is bonded by couplant and sample to be tested；Afterbody optical fiber 1 does not encapsulate；Steel
The side steel covering of needle tubing 3 is ground off；
Laser is launched laser conduction to fiber-optic grating sensor, described sensitized reaction fibre optical sensor sensing tabular and treated
The acoustic signals of test specimens surface certain point, acoustic signals change into electric signal and reach demodulating system, and demodulating system is demodulated, and is obtained
Obtain last acoustical signal.Hanging during the steel needle tubing partial test of sensitized reaction fibre optical sensor, enhancing fixing device measures
The vibration of acoustical signal；Needle tubing side steel covering is ground off to suppress steel pipe itself vibration, improve the spirit of fiber-optic grating sensor
Sensitivity.
In the present invention, core of the used fiber grating as sensor, its optical fiber grating sensing area 4 is used to examine
The acoustic emission signal that certain in drafting board is put, acoustical signal give fiber grating one stress, change its operation wavelength.The work of fiber grating
Wavelength, which changes, meets equation：
Wherein, λBFor the centre wavelength of Active Optical Fiber grating, Λ is the Fourier components equivalent period of Active Optical Fiber grating,
neFor the effective refractive index of fiber grating.
In the present invention, used couplant will a little bond on the outside of fixing device with sample to be tested, exclude sensor
Air between sample to be tested, fiber grating is set only a little to be measured to sample to be tested surface.
In the present invention, used steel needle tubing is parallel with sample to be tested surface when testing and vacantly sets, and can strengthen
Acoustical signal, it is packaged in outside fiber grating, is easy to the acoustical signal of certain point in measurement space.
In the present invention, used steel needle tubing covering is ground off to suppress steel pipe itself vibration, improves optical fiber grating sensing
Device sensitivity.
In the present invention, laser needed for used laser transmitting, the light measured as fiber-optic grating sensor
Source.
In the present invention, used demodulating system demodulation method is simple, receives the electric signal stored in capture card, passes through solution
Adjust and obtain last acoustical signal.
Fibre-optic sensor package mode and detecting system of the present invention have small volume, point contact type survey can be achieved
The characteristics of amount, it is easy to the acoustical signal of certain point in measurement plate, it is possible to increase sensing sensitivity, be a kind of new to be used for sound in plate
Transmission signal detects the sensitized reaction mode and detecting system with positioning.
In the present invention, fiber grating is packaged by using steel needle tubing and fixing device, will be fixed with couplant
A little bonded on the outside of device with sample to be tested, fiber grating is only a little measured to sample to be tested surface, and make steel
Needle tubing part processed is vacantly to strengthen acoustical signal.Overcome because the sensitive zones of fiber grating are longer, the signal received is whole
Integration on individual sensitive zones, it is difficult for caused by measuring the acoustical signal of high frequency sound field single-point.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, various equivalent modifications can be readily occurred in or replaced
Change, these modifications or substitutions should be all included within the scope of the present invention.Therefore, protection scope of the present invention should be with right
It is required that protection domain be defined.
Claims (6)
1. a kind of be used to detect the sensitized reaction optical fiber sensing system with acoustic emission signal in location-plate, the system includes laser
Device, sensing module and demodulating system, it is characterised in that described sensing module is sensitized reaction fibre optical sensor, described increasing
Quick packaged fiber sensor is connected with demodulating system；
Described laser launches laser conduction to fiber-optic grating sensor, described sensitized reaction fibre optical sensor sensing tabular
The acoustic signals of sample to be tested surface certain point, acoustic signals change into electric signal and reach demodulating system, and demodulating system is demodulated,
Obtain last acoustical signal.
A kind of 2. sensitized reaction Fibre Optical Sensor system for being used for acoustic emission signal in detection and location-plate according to claim 1
System, it is characterised in that the package casing of described sensitized reaction fibre optical sensor includes the steel needle tubing and and steel located at head
The cylindric fixing device of needle tubing connection processed.
A kind of 3. sensitized reaction Fibre Optical Sensor system for being used for acoustic emission signal in detection and location-plate according to claim 2
System, it is characterised in that described steel needle tubing and the junction of cylindric fixing device are in conical surface-shaped.
A kind of 4. sensitized reaction Fibre Optical Sensor system for being used for acoustic emission signal in detection and location-plate according to claim 2
System, it is characterised in that described cylindric fixing device passes through couplant and tabular sample to be tested surface bonding.
A kind of 5. sensitized reaction Fibre Optical Sensor system for being used for acoustic emission signal in detection and location-plate according to claim 4
System, it is characterised in that described steel needle tubing is vacantly parallel with tabular sample to be tested surface.
A kind of 6. sensitized reaction Fibre Optical Sensor system for being used for acoustic emission signal in detection and location-plate according to claim 2
System, it is characterised in that the side of described steel needle tubing, which grinds off surface coverings, makes its structure asymmetric.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710426582.3A CN107356318B (en) | 2017-06-08 | 2017-06-08 | Sensitivity-enhanced packaged optical fiber sensing system for detecting and positioning acoustic emission signals in board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710426582.3A CN107356318B (en) | 2017-06-08 | 2017-06-08 | Sensitivity-enhanced packaged optical fiber sensing system for detecting and positioning acoustic emission signals in board |
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| Publication Number | Publication Date |
|---|---|
| CN107356318A true CN107356318A (en) | 2017-11-17 |
| CN107356318B CN107356318B (en) | 2019-12-27 |
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| CN201710426582.3A Active CN107356318B (en) | 2017-06-08 | 2017-06-08 | Sensitivity-enhanced packaged optical fiber sensing system for detecting and positioning acoustic emission signals in board |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6173606B1 (en) * | 1999-03-04 | 2001-01-16 | Titan Specialties, Ltd. | Logging tool for cement evaluation |
| CN101592757A (en) * | 2009-06-25 | 2009-12-02 | 清华大学 | Cascade long-period fiber grating device and manufacture method thereof and humidity sensing system |
| CN103487129A (en) * | 2013-01-18 | 2014-01-01 | 上海大学 | Point contact type ultrasonic wave sensor |
| CN204831618U (en) * | 2015-07-21 | 2015-12-02 | 北京品傲光电科技有限公司 | High sensitivity temperature sensor for meteorological phenomena |
| CN106353407A (en) * | 2016-09-21 | 2017-01-25 | 成都创慧科达科技有限公司 | Fiber bragg grating sound emission testing system |
-
2017
- 2017-06-08 CN CN201710426582.3A patent/CN107356318B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6173606B1 (en) * | 1999-03-04 | 2001-01-16 | Titan Specialties, Ltd. | Logging tool for cement evaluation |
| CN101592757A (en) * | 2009-06-25 | 2009-12-02 | 清华大学 | Cascade long-period fiber grating device and manufacture method thereof and humidity sensing system |
| CN103487129A (en) * | 2013-01-18 | 2014-01-01 | 上海大学 | Point contact type ultrasonic wave sensor |
| CN204831618U (en) * | 2015-07-21 | 2015-12-02 | 北京品傲光电科技有限公司 | High sensitivity temperature sensor for meteorological phenomena |
| CN106353407A (en) * | 2016-09-21 | 2017-01-25 | 成都创慧科达科技有限公司 | Fiber bragg grating sound emission testing system |
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| Publication number | Publication date |
|---|---|
| CN107356318B (en) | 2019-12-27 |
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